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IEEE Transactions on Aerospace and Electronic Systems

Issue 2 • April 1999

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Displaying Results 1 - 25 of 34
  • Coverage area analysis for decentralized detection in Weibull clutter

    Publication Year: 1999, Page(s):437 - 444
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (501 KB)

    The performance of a decentralized constant false-alarm rate (CFAR) detection system with data fusion in homogeneous non-Gaussian background is analyzed in terms of ground area covered. The advantages of using a distributed radar system and the differences between the system behavior in Rayleigh clutter and in Weibull clutter are stressed. Notably, the increasing benefit of cooperative decision ma... View full abstract»

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  • IMM/MHT solution to radar benchmark tracking problem

    Publication Year: 1999, Page(s):730 - 738
    Cited by:  Papers (35)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (210 KB)

    The benchmark problem addresses the efficient allocation of an agile beam radar in the presence of highly maneuverable targets and radar electronic countermeasures (ECM). This paper presents methods for applying an interacting multiple model/multiple hypothesis tracking (IMM/MHT) tracker to this radar tracking and resource allocation problem. The manner in which IMM/MHT tracking and data associati... View full abstract»

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  • An interior point linear programming approach to two-scan data association

    Publication Year: 1999, Page(s):474 - 490
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1228 KB)

    We present an efficient two-scan data association method (TSDA) based on an interior point linear programming (LP) approach. In this approach, the TSDA problem is first formulated as a 3-dimensional assignment problem, and then relaxed to a linear program; the latter is subsequently solved by the highly efficient homogeneous, self-dual interior point LP algorithm. When the LP algorithm generates a... View full abstract»

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  • Statistical analyses of measured radar ground clutter data

    Publication Year: 1999, Page(s):579 - 593
    Cited by:  Papers (112)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1272 KB)

    The performance of ground-based surveillance radars strongly depends on the distribution and spectral characteristics of ground clutter. To design signal processing algorithms that exploit the knowledge of clutter characteristics, a preliminary statistical analysis of ground-clutter data is necessary. We report the results of a statistical analysis of X-band ground-clutter data from the MIT Lincol... View full abstract»

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  • Optical guidance for autonomous landing of spacecraft

    Publication Year: 1999, Page(s):459 - 473
    Cited by:  Papers (49)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1628 KB)

    An autonomous rendezvous guidance scheme for spacecraft to descend to small celestial bodies by using optical information is presented. First, a new guidance, navigation, and control (GNC) method based on fixation-point (FP) inheritance is proposed. A spacecraft can safely descend toward the target point on the celestial body by tracking and autonomously renewing the FPs on the surface. Next, we d... View full abstract»

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  • Robust speed sensorless induction motor drive

    Publication Year: 1999, Page(s):566 - 578
    Cited by:  Papers (32)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (852 KB)

    A speed sensorless induction motor (IM) drive with robust control characteristics is introduced. First, a speed observation system, which is insensitive to the variations of motor parameters, is derived based on the concept of sliding mode. Next, an integral-proportional (IP) speed controller using the estimated speed signal is designed to stabilize the speed loop. Then, to preserve the robust con... View full abstract»

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  • Ship target recognition using low resolution radar and neural networks

    Publication Year: 1999, Page(s):386 - 393
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (596 KB)

    The classification of ship targets using low resolution down-range radar profiles together with preprocessing and neural networks is investigated. An implementation of the Fourier-modified discrete Mellin transform is used as a means for extracting features which are insensitive to the aspect angle of the radar. Kohonen's self-organizing map with learning vector quantization (LVQ) is used for the ... View full abstract»

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  • Structures for radar detection in compound Gaussian clutter

    Publication Year: 1999, Page(s):445 - 458
    Cited by:  Papers (82)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1016 KB)

    The problem of coherent radar target detection in a background of non-Gaussian clutter modeled by a compound Gaussian distribution is studied here. We show how the likelihood ratio may be recast into an estimator-correlator form that shows that an essential feature of the optimal detector is to compute an optimum estimate of the reciprocal of the unknown random local power level. We then proceed t... View full abstract»

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  • Numerical optimization method for array signal processing

    Publication Year: 1999, Page(s):549 - 565
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1188 KB)

    This paper presents a novel and efficient extrema-mapping algorithm, which we call the roller-coaster algorithm. Two versions of the algorithm, the one-dimensional (1-D) and the two-dimensional (2-D) roller-coaster, are developed. Its applicability to array signal processing is demonstrated. We use it to solve a multiple source direction finding problem using multiple signal classification (MUSIC)... View full abstract»

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  • Electromechanical flight actuators for advanced flight vehicles

    Publication Year: 1999, Page(s):511 - 518
    Cited by:  Papers (34)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (540 KB)

    The aircraft flight quantities and success of the mission depend to a great extent upon the actuator performance, and flight actuators must be designed to achieve the specified criteria. Electromechanical flight actuators driven by electric motors have begun to displace hydraulic technology in advanced flight vehicles. In aerospace application, permanent-magnet stepper motors are perfectly suited ... View full abstract»

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  • Coherent spatial filtering for SAR detection of stationary targets

    Publication Year: 1999, Page(s):614 - 626
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1068 KB)

    Analysis of UHF synthetic aperture radar (SAR) images has revealed a spatially correlated phase structure over a resolved target such as a long wire or a large truck. This phase variation, approximated by a simple, range-dependent factor 4πr/λ, results in a line-shaped image spatial spectrum. Such image phase and spectral features can be exploited by coherent spatial filtering to improve... View full abstract»

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  • Angle/Doppler estimation in heavy-tailed clutter backgrounds

    Publication Year: 1999, Page(s):419 - 436
    Cited by:  Papers (31)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1196 KB)

    This work describes new methods on the modeling of the amplitude statistics of airborne radar clutter by means of alpha-stable distributions. We develop joint target angle and Doppler, maximum likelihood-based estimation techniques from radar measurements retrieved in the presence of impulsive uncorrelated noise modeled as an alpha-stable random process. We derive the Cramer-Rao bounds (CRBs) for ... View full abstract»

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  • Prime sequences for asynchronous pulse repetition interval agile radar

    Publication Year: 1999, Page(s):543 - 548
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    We propose the use of prime sequences in pulse repetition agile radar to increase the immunity of the radar to reconnaissance and deceptive jamming. The prime sequences are mapped into state agile mapped (SAM) sequences and are used to determine the pulse repetition interval (PRI) of the radar. We show that this produces a system with low mutual interference between radars and with a low probabili... View full abstract»

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  • Polytime coding as a means of pulse compression

    Publication Year: 1999, Page(s):716 - 721
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (460 KB)

    A set of code sequences is proposed for radar applications in which all phase steps are equal and the time duration of each phase state is varied in order to properly approximate either a stepped-RF waveform or a linear FM waveform. Since these proposed waveforms have varying time durations at each phase state, they are referred to as “Polytime” codes. Polytime code sequences have the ... View full abstract»

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  • Line-of-sight pointing stability for "drifting" satellites

    Publication Year: 1999, Page(s):504 - 510
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    Explored here is the feasibility of a new attitude control approach for satellites in high altitude elliptic orbits, in order to compensate for the effect of longitudinal periodic drift relative to the ground station. A simple attitude control technique using tethers has been proposed for achieving the fixed apparent satellite orientation with respect to the ground segment of the space mission. Co... View full abstract»

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  • High power factor operation of DCM series-parallel resonant converter

    Publication Year: 1999, Page(s):602 - 613
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (812 KB)

    This work presents the operating principle, analysis, design, simulation, and experimental results for a high frequency (HF) transformer isolated single stage ac-to-dc series-parallel resonant converter (SPRC) operating on the utility line, in discontinuous current mode (DCM). The equivalent circuit models and the state space analysis of the SPRC in DCM are presented. PROMATLAB software is used to... View full abstract»

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  • Sensor alignment with Earth-centered Earth-fixed (ECEF) coordinate system

    Publication Year: 1999, Page(s):410 - 418
    Cited by:  Papers (54)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    In this work, we formulate the multiple sensor alignment problem in an Earth-centered Earth-fixed (ECEF) coordinate system. The alignment algorithm maps the sensor measurements to the ECEF coordinates using a geodetic transformation, and attributes the discrepancies in the Earth-referenced system reported by each sensor to the sensor biases. Sensor biases are then estimated using the least squares... View full abstract»

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  • Bidirectional DC-to-AC inverter with improved performance

    Publication Year: 1999, Page(s):533 - 542
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (640 KB)

    Switch-mode DC-to-AC inverters using DC-to-DC converter topology have many advantages over the traditional bridge-type inverter. A bidirectional power circuit combined with a nonlinear robust control is proposed to form a high performance inverter. The output voltage of the inverter can be stabilized regardless of large changes in input voltage and output current. The distortion near the zero cros... View full abstract»

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  • Spacecraft pointing control criteria for high resolution spectroscopy

    Publication Year: 1999, Page(s):637 - 644
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    A new pointing control criterion is derived to support high resolution space spectroscopy. The criterion maps desired specifications on allowable flux offset (imposed by scientists for accurate calculation of spectral line ratios) into standard pointing control definitions in terms of bias and jitter. In contrast to previous derivations, the new criterion is exposure dependent, and fully captures ... View full abstract»

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  • Bandwidth maximization for satellite laser communication

    Publication Year: 1999, Page(s):675 - 682
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    Free space optical communication between satellites networked together can make possible high speed communication between different places on Earth. The basic free space optical communication network includes at least two satellites. In order to communicate between them, the transmitter satellite must track the beacon of the receiver satellite and point the information optical beam in its directio... View full abstract»

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  • JointSTARS and GMTI: past, present and future

    Publication Year: 1999, Page(s):748 - 761
    Cited by:  Papers (52)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1628 KB)

    The concept of airborne surveillance of enemy ground forces with a Ground Moving Target Indicator [now called GMTI] radar capable of detecting moving ground vehicles and helicopters was proposed in 1968 and resulted in a DoD program to realize its potential. This article traces the program history starting with the Army's Stand Off Target Acquisition System [SOTAS] as it evolved through the Small ... View full abstract»

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  • Extended version of Van Trees's receiver operating characteristic approximation

    Publication Year: 1999, Page(s):709 - 716
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    Approximate expressions are developed for the receiver operating characteristics (ROCs) of two binary detectors, one based on random-vector observations, the other seeking continuous-time Gaussian signals in white Gaussian noise. The approach used is to extend Van Trees's good-performance-regime results (PF⩽0.5, PD ⩾0.5) to a much larger ROC range. The accuracy of the... View full abstract»

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  • Capturability of the 3-dimensional pure PNG law

    Publication Year: 1999, Page(s):491 - 503
    Cited by:  Papers (37)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (748 KB)

    Although a lot of effort has been recently devoted to the capturability analysis of the pure proportional navigation guidance (PPNG) law, there are still significant discrepancies between the analysis results and the actual capturability of the PPNG law. In this paper, a Lyapunov-like approach along with a vector analysis method based on the so-called LOS (line of sight) plane is introduced to ana... View full abstract»

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  • Distribution of the envelope of a sum of random sine waves and Gaussian noise

    Publication Year: 1999, Page(s):594 - 601
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (516 KB)

    The cumulative distribution of the envelope of the sum of a sinusoidal signal, a number M of randomly phased interfering sine waves, and, possibly, Gaussian noise is expressed as the sum of Marcum's Q-function and an asymptotic series of Laguerre polynomials, much like the ordinary Edgeworth series for the distribution of the sum of a number of independent random variables. A test of the method wi... View full abstract»

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  • A track filter for reentry objects with uncertain drag

    Publication Year: 1999, Page(s):394 - 409
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1224 KB)

    A filter was developed for maintaining track on ballistic missiles whose drag profiles are unknown or deviate significantly from prior predictions. The filter employs an innovative form of a seven-state Kalman filter in which object drag is included as a state to be estimated. Using measurements of range, azimuth, and elevation, the filter can track endo- and exo-atmospheric targets on a wide vari... View full abstract»

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Aims & Scope

IEEE Transactions on Aerospace and Electronic Systems focuses on the organization, design, development, integration, and operation of complex systems for space, air, ocean, or ground environment.  These systems include, but are not limited to, navigation, avionics, spacecraft, aerospace power, radar, sonar, telemetry, defense, transportation, automated testing, and command and control. 

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Meet Our Editors

Editor-in-Chief
Lance Kaplan
Army Research Laboratory